V-belt sheave



Nov. 22, 1949 R. H. GALBREATH Filed Jan. 9, 1947 w m m Patented Nov. 22, 1949 V-BELT SHEAVE Robert Harvey Galbreath, Denver, Colo., assignor to Howry-Berg Steel & Iron Works, Denver,

Colo.

Application January 9, 1947,iseria1 No. 720,979

1 Claim. I

This invention relates 'to a V-belt pulley or sheave, and has forits principal object the provision of a sheave construction in which the sha'ft hub can be quickly and easily assembled to form sheaves of various diameters to accommodate shafts of various sizes.

Another object of the invention is to provide a demountable hub construction for V-belt sheaves which will develop a maximum torque resistance between the hub and the sheave; which Will automatically accommodate varying thicknesses in the metal of the sheave parts; which will employ two identical stamped steel plate parts to form the sheave; and in which all of the hub parts can be cheaply and efiiciently manufactured as screw machine products.

A further object of the invention is to provide a groove construction for V-belt sheaves which will have a rounded, smooth edge for safety reasons, and which will have a double wall thickness at the belt groove for structural reasons.

Other objects and advantages reside in the detail construction of the invention, which is designed for simplicity, economy, and efiiciency.

These will become more apparent from the following description.

In the following detailed description of the invention, reference is had to the accompanying drawing which forms a part hereof. Like numerals refer to like parts in all views of the drawing and throughout the description.

In the drawing:

Fig. 1 is a side view of a V-belt sheave, showing the new construction;

Fig. 2 is a vertical cross-section therethrough, taken on the line 2-2, Fig. 1;

Fig. 3 is a section taken on the line 3-3, Fig. 2; and

Fig. 4 is a side view of a circular metal stamping forming one-half of the wheel portion of the improved V-belt sheave.

The wheel portion of the improved sheave consists of two identically similar parts having a contour as shown in Fig. 4. Each part comprises a, circular disc IO of sheet or plate metal having a central hub opening of a non-circular outline. The preferred hub opening is shown in Fig. 4 and consists of two concentric arcuate sides |2, separated by two parallel flat sides |3.

The portion of the disc around the opening is indented, as shown at |4, so that when two of these discs are together, a circular receiving socket will be formed around the opening for the reception of an annular spacing washer |5.

The periphery of the disc IO is fiared outwardly to form one-half of a V-belt receiving groove |6 when two discs are together. The peripheral edge of each disc is rolled back upon itself to form a smooth circular bead and thence is extended inwardly on an incline to form a double wall IB for the groove |6. i

' The discs |0 are mounted on a demountable hub |9 having a shaft bore 26 of any desired diameter. The hub consists of an enlarged shoulder portion 20, a non-circular mounting portion 2| of less diameter than the shoulder portion 20, and a threaded portion 22 of less diameter than the mounting portion 2|.

The shoulder portion may be provided with a set screw socket 21, or other shaft-engaging means. The shape of the mounting portion 2| is such as will fit snugly into the disc openings it being provided with two flat sides 23 for fitting against the two fiat sides 3 of the opening. The threaded portion 22 is designed to receive a threaded nut 24 which is preferably, but not necessarily, of a hexagonal outline.

The inner face of the nut 24 is recessed, as shown at 25, the diameter of the recess slightly exceeding the diameter of the mounting portion 2| so that a portion of the nut 24 may extend over the mounting portion 2 I.

The sheave is assembled by placing one of the discs Ifl over the mounting portion 2| against the shoulder portion 20. The annular spacing washer |'5 is then placed over the portion 2| and covered by a second disc |0. The two discs |0 are faced in opposite directions to form the socket for the washer |5, and to form the complete V-belt groove |6. The entire assembly is then clamped in place by tightening the nut 24 on the threaded portion 22.

The width of the mounting portion 2| is substantially equal to the total thickness of two of the discs IO plus the thickness of the washer 5. It is not essential, however, that these be in accurate correspondence, for should the assembly of discs and washers be slightly less than the width of the portion 2|, the nut 24 can pass over the latter to vertically engage the outer disc IO. On the other hand, if the thickness of the assembly exceeds the width of the portion 2|, the nut 24 can still act to clamp the assembly in concentric relation.

The sheaves are supplied to the trade as a plurality of the discs |0 of various diameters, all having the same sized hub opening I. A variety of the hubs |9 are supplied having various diameters of shaft bores 26, but all having the same outer diameters and contours. The dealer can then quickly assemble the parts to provide sheaves of any desired diameter for any given shaft size.

While a specific form of the improvement has been described and illustrated herein, it is desired to be understood that the same may be varied within the scope of the appended ciaim, without departing from the spirit of the invention. o

Having fthirs ;descbed the invention, what is ciaimed and desired secured biy Letters Patent is:

A sheave comprising a wheel having a non-circular opening through its center and formed of duplicate side discs having portions surrounding the center opening and spaced from each other and forming a pocket, a thick ring of stiff metal fitting snugiy in the pocket, a hub bored longitudinally and passed longitudinaiy through 'the center opening of the Wheei, said hub ;being formed of hard metal and having an intermediate porton conforming externally to the non-circular opening of the wheel and fitting .snugly therein, one end por'tion of the hub being externaliy .of increased diame'ter and forming a head having an inner side face onstituting a Vshoulder extending circumferentially about the hub and bearing against one side disc, the other end portion of the hub being of reduced diameter and externally threaded, and a nut screwed upon the threaded end portion of the hub and at its inner end being of internally reduced diameter to form an annular recess into which the adjacent end portion of the hub about which the wheel fits is snugly received, said inner end of the nut being in grzipping engagement 'with second disc of the wheel and causing the wheel *to \be firmly gripped between the nut and the shoulder, said nut being adapted to apply pressure to hold the d'iscs and the ring forming the wheel in close contacting engagement with each other,

ROBERT HARVEY GALBREATH.

REFERENCES CITED The `foilowing references are of record in the file of this patent:

UNITED STATES PA'I'EN'I'S Number Name Date 1,832,871 .Meyer Nov. 24, 1931 2,188,953 Mitchell Feb. 6, 1940 FOREIGN PATENTS Number Country Date 373,080 Germany Apr. '7, 1923 

